Hey @PNCD – sorry for the slow response here. Can you search for one of the missing genres, navigate to its page, click the edit pencil, and confirm what its parent genre is?
Genre display settings in Roon are fully editable, meaning you can toggle the display of genres from Roon’s metadata or the tags from your files, and you can edit the hierarchy.
That said, hiding Roon’s genres doesn’t edit or automatically disable the hierarchy, so delta blues is still going to be considered a subgenre of blues. If you have both in your library and consider Delta Blues to also be top level, you can edit the parent genre to be “Top Level”.
Let me know if that clears this up Peter. Thanks!